A flash mob , later identified as "The Mob", shuts down Ocean Drive briefly by cutting off the streets with retro convertibles and dancing on cars to music blasted by DJ Penelope Cleopatra Coleman. A few complain about their public disturbance, while others praise it. After they get off work, they sneak into the hotel's beach club, claiming to be guests, not employees. Meanwhile, across the club at the bar, Emily Anderson Kathryn McCormick tries to get the bartender's attention, but ends up preparing her own beer.
Sean, who is immediately smitten by her, asks for a beer. She tells him it's on the house, then heads down to the beach to dance, resulting in a dance battle between the two, but ending with Emily suddenly running off when she sees one of her dad's business partners, Trip. Sean, their waiter, immediately recognizes her, but Emily spills her orange juice in an attempt to distract Sean.
He helps clean it up, but when he goes too far Emily immediately storms off in an angry fit with Sean following her into the hotel's ballroom, where Emily begins a fast contemporary dance, oblivious to Sean's presence. After Emily notices Sean and warms up to him, she explains to him that she's trying to nail an audition for the prestigious Winwood Dance Academy Company, which she is already a pupil of. Sean advises her to incorporate faster, more interesting moves, but Emily declines, saying that there are rules.
Sean, in turn, tells her to break the rules, giving her an address and telling her to come there. Emily does and finds herself at the Miami Museum of Fine Arts, where the paintings and statues come to life, which is work of the Mob. By telling her to attend, Sean basically reveals to her his participation in the Mob. The next day, Emily persuades Sean to let her take part in their next Mob, which is scheduled to hit a restaurant the following week.
Eddy immediately dislikes Emily, giving her the lead to test her. He also explains that they are trying to win a contest through YouTube by getting 10 million hits on the site. The flashmob goes well and Eddy admits that Emily did great. They then celebrate at Ricky's, where Sean and Emily salsa together, much to everyone's delight.
Sean and Emily then sneak onto a boat Sean had reserved for himself to sail down the river. There, they bond over their mothers both not being a part of their lives, and they kiss and sleep on the boat until morning. When they hurry back to Ricky's, which turns out to be owned by Sean's uncle Ricky, Ricky reveals to them that Emily's dad, a building tycoon, is planning to develop the strip, destroying Ricky's bar, Sean's home, Sean's sister's home and workplace, and many other things.
Enraged, Emily storms off to talk to her dad, with Sean following behind her. Emily wants to tell the MOB who her dad is, but is reluctantly convinced by Sean not to. She instead finds out from her dad that there will be a meeting to determine whether the project to develop the strip goes through or not. She convinces the rest of the Mob to protest the plans. Their dance is a huge hit, gaining the group over a million more views.
Eddy finds out that Emily is William's daughter through watching a tape of Sean and Emily rehearsing where she reveals the truth, without knowing that they are being recorded. Enraged, he reveals with the Mob to William through a protest dance that Emily is a part of the Mob. This ruins relationships for Emily with Sean romantically , Eddy friendly , William trustfully , and the rest of the Mob.
Emily leaves embarrassed, and Sean, brokenhearted, is arrested for trying to stop Eddy from being arrested after they fight. Emily had rehearsed her Winwood audition piece as a duet with Sean, but now that she and Sean are estranged, she no longer has him as a dance partner. Instead, she adapts the piece, dancing it as a solo performance. The result falls flat and she fails her audition for the troop. She finally meets Sean, and tells him she is going back to work for her dad, per a promise she made with her dad that if she did not become a professional dancer by the end of the summer that she would work at his hotel.
After Sean and Eddy were sent to jail for being caught in the flashmob, Ricky bails them out and Sean and Eddy make up. Sean convinces the Mob to do one last protest to speak for the people who don't have a voice, but the Mob gives them one.
Sean and Emily then perform the original audition piece. Seeing his daughter so happy, William decides to build up the community rather than tear it down, and he and Emily reconcile. Sean and Emily kiss passionately and make up, and Sean and Eddy make a deal with the owner of the marketing firm that represents Nike for the Mob to dance in their commercials. He, Sean, and Jason work as waiters at the Dimont Hotel, but he gets fired by William for being late to work one day, which fuels his aggression towards him.
He makes a cameo in the film, Moose gets a call from Jason to come to Miami and help him and the Mob which he does and brings some of the Pirates. Chadd "Madd Chadd" Smith as Vladd. He makes a cameo, also a member of the Pirates, his character appears with Moose and Jenny Kido in the final dance scene. She makes a cameo, her character appears with the rest of The Pirates along with Moose.